CN211595118U - Magnetic coagulation reaction device - Google Patents

Abstract

The utility model relates to a magnetic coagulation reaction device, which comprises a coagulation reaction box, wherein a slag blocking device for blocking suspended matters and/or floating objects is arranged in the coagulation reaction box; the utility model provides a magnetism reaction unit that thoughtlessly congeals, compact structure, reasonable in design through blocking the sediment device integration in the reaction box that thoughtlessly congeals, not only can carry out the quenching and tempering to sewage to subsequent sewage treatment can effectively block the debris in the sewage moreover, prevents in the subsequent process equipment that debris got into, in addition, can avoid building and block the sediment channel, makes with low costs, operation maintenance convenient, is particularly useful for portable sewage treatment system.

Description

Magnetic coagulation reaction device

The application claims the application number as: 201811600933.9, title of the invention: the utility model provides a novel super magnetic separator, the application date is: full priority of the invention patent application on 12/26/2018.

Technical Field

The utility model relates to a sewage treatment technical field, concretely relates to magnetism reaction unit that thoughtlessly congeals.

Background

Sewage treatment methods can be generally classified into four categories according to the principle of action: physical, chemical, physicochemical, and biological methods. Both the magnetic coagulation sedimentation method and the super-magnetic separation method belong to physical and chemical methods, and are widely applied to the application fields of sewage interception treatment, water environment treatment, sewage treatment plant upgrading and reconstruction and the like at present.

Because polluted water bodies usually contain impurities such as garbage, floating objects, suspended objects and the like, and each device in a sewage treatment process flow is easy to block or even damage, in the prior art, a slag blocking device (usually a grating) is usually arranged at a sewage pretreatment stage before the sewage treatment process flow for slag blocking treatment, and due to the design, some problems usually exist, for example, 1, the existing slag blocking device usually has the problem of slag leakage, and part of the impurities such as the garbage, the floating objects or the suspended objects which are not intercepted always enter a magnetic coagulation reaction device, so that the problems of subsequent working section blocking, equipment breaking and the like are easily caused. 2. In the current water environment treatment, the real-time property, the emergency property and the high efficiency of sewage treatment become important indexes for measuring sewage treatment, and in the traditional slag blocking process, the construction of slag blocking channels (such as grid channels and the like) needs to spend a large amount of manpower, material resources and financial resources, so that the cost is high, the time period of sewage emergency treatment is greatly prolonged, and the sewage treatment is not favorable for treating sewage quickly, efficiently and at low cost.

SUMMERY OF THE UTILITY MODEL

For improving the not enough that exists among the prior art, the utility model provides a magnetic coagulation reaction unit, compact structure, reasonable in design not only can carry out the quenching and tempering to sewage to subsequent sewage treatment can effectively block the debris in the sewage moreover, prevents in the subsequent process equipment that debris got into, in addition, can avoid building and block the sediment channel, makes with low costs, the time cycle of sewage emergency treatment short, is particularly useful for portable sewage treatment system.

The utility model adopts the technical proposal that:

the magnetic coagulation reaction device comprises a coagulation reaction box, wherein a slag blocking device used for blocking suspended matters and/or floating objects is arranged in the coagulation reaction box. In the process of treating sewage by ultra-magnetic separation, a coagulation reaction box is generally used for providing a space for mixing magnetic seeds, PAC (polyaluminium chloride) agents, PAM (polyacrylamide) agents and sewage so as to adjust the quality of the sewage, so that the subsequent magnetic separation process can be normally and efficiently carried out, in the scheme, a slag blocking device is integrated in the coagulation reaction box and is used for blocking sundries such as garbage, floaters or suspended matters carried in the sewage, so that the sundries such as the garbage, the floaters or the suspended matters can be prevented from entering a subsequent treatment workshop section, the problems of blockage of the subsequent workshop section, equipment breakage and the like are avoided, the structure of the whole sewage treatment system is more compact, the arrangement of water inlet slag blocking devices (such as gratings and the like) can be reduced, a slag blocking channel does not need to be independently built, and the building requirements, civil engineering cost and the like of the slag blocking channel in the prior art can, can effectively shorten the time period of emergency treatment of sewage, and is particularly suitable for a mobile sewage treatment system.

Preferably, at least two stages of stirring cavities are arranged in the coagulation reaction box, the stirring cavities at all stages are communicated in sequence, and the slag blocking devices are respectively arranged between the adjacent two stages of stirring cavities. In this scheme, through setting up multistage stirring chamber, be favorable to mixing more evenly, and be favorable to improving the water conservancy dwell time of sewage to realize better quenching and tempering, more be favorable to subsequent magnetic separation effect.

Preferably, the slag blocking device comprises a grid, the grid is obliquely arranged in the coagulation reaction box, and the oblique angle is 45-60 degrees. The grid is a sediment device that blocks commonly used, simple structure, low in production cost, installation are dismantled conveniently, and the grid that the slope set up, debris such as rubbish, floater or the suspended solid that both can make the interception are kept somewhere on the grid, avoid again along with sewage removal, the staff of being convenient for again utilizes specialized tool (like the tine harrow etc.) to dig the sediment, is more convenient for separate debris from the grid to the realization is to the clearance of grid.

Furthermore, the grid comprises a frame and a plurality of grid bars, wherein the grid bars are mutually parallel and fixed on the frame, and a flow passage for sewage to pass through is formed between every two adjacent grid bars. In the scheme, the grid is composed of a plurality of grid bars which are parallel to each other, the gaps between every two adjacent grid bars form the overflowing channels for sewage to pass through, and the overflowing channels are parallel to each other, so that workers can clean grid slag (sundries) on the grid efficiently along one direction.

Preferably, the cross section of the grid bars is rectangular, trapezoidal or triangular, or the flow passage formed between two adjacent grid bars in the grid is in a horn-shaped structure. Especially, when the cross section of the grid bars is trapezoidal or triangular, the gap between two adjacent grid bars can form a flow passage with a horn-shaped structure, when the grid is installed, the large end surface of the overflowing channel corresponds to the upstream of the sewage, and the small end surface of the overflowing channel corresponds to the downstream of the sewage, when sewage passes through the grating, the sewage enters from the large end surface of the overflowing channel and flows out from the small end surface, impurities in the sewage can be pushed on the grating by utilizing the hydraulic difference in the flowing process, thereby realizing high-efficiency interception and filtration of sundries, being favorable for realizing better matching with the toothed harrow on the other hand, leading the toothed harrow to be accurately attached with the grids, thereby effectively reducing the slag leakage phenomenon, being beneficial to more thoroughly and efficiently cleaning the grid slag (sundries) on the grid, and simultaneously being beneficial to reducing the mechanical abrasion, noise and the like between the toothed harrow and the grid.

Preferably, the distance between two adjacent grid bars in the grid is 3 mm-30 mm. The size is moderate, and impurities with different sizes in the sewage can be intercepted.

Further, along the flowing direction of sewage, the clearance between two adjacent bars in each grid is constantly reduced, and the clearance is used for passing through sewage. In this scheme promptly, the specification of each grid is different, along the flow direction of sewage, is used for constantly reducing through the clearance size of sewage in each grid, can effectively intercept the debris of equidimension not in the sewage, realizes better interception effect, more is favorable to subsequent sewage treatment process, can effectively avoid appearing blockking up and the problem that debris caused equipment to damage.

Furthermore, overflow ports are respectively arranged on one side or two sides of the slag blocking device, and the overflow ports are used for overflowing. When the slag blocking device (such as a grid) is blocked by grid slag (sundries), the water level in the stirring cavity rises and can overflow from the overflow port to the next-stage stirring cavity, so that the interruption of the sewage treatment process is avoided, and the magnetic coagulation reaction device can stably run for a long time.

In an optimized scheme, two adjacent two-stage stirring cavities are isolated through two partition plates, the two partition plates are respectively a first partition plate and a second partition plate, the first partition plate and the second partition plate enclose an overflow cavity, wherein the first partition plate is provided with a notch, a grid is arranged in the notch, overflow ports are respectively arranged on two sides of the notch and used for overflowing, and a water passing port is formed between the lower end of the second partition plate and a bottom plate of the coagulation reaction box and used for communicating the adjacent two-stage stirring cavities. In this scheme, when utilizing the grid to intercept suspended solid and floater in the sewage, fully considered the grid and blockked up the problem that leads to the interior liquid level of stirring chamber to rise, and the demand of overflow just in time can be satisfied in the design of overflow mouth, ensures to coagulate reaction unit and can normally operate.

The automatic control alarm device comprises a controller, an alarm and a liquid level sensor, wherein the alarm and the liquid level sensor are respectively connected with the controller, the liquid level sensor is arranged in the stirring cavity and used for detecting liquid level height data of the upstream of the slag blocking device and sending the liquid level height data to the controller, and when the liquid level height data are larger than a set threshold value, the controller controls the alarm to send out an alarm signal. So as to remind the staff to clean the grid slag (sundries) on the slag blocking device in time.

Furthermore, the stirring device is arranged in the stirring cavity and used for stirring. Through setting up agitating unit, can effectively improve the mixing efficiency of stirring intracavity for sewage and PAC medicament and PAM medicament can be in the short time abundant contact, and the homogeneous mixing.

Preferably, the stirring device comprises a driving motor, a transmission rod and a paddle arranged on the transmission rod, the driving motor is fixed above the coagulation reaction box, the upper end of the transmission rod is connected with the driving motor, and the paddle rotates under the driving of the driving motor, so that the stirring function is realized.

Compared with the prior art, use the utility model provides a pair of magnetic coagulation reaction unit has following beneficial effect:

1. among this magnetic coagulation reaction unit, compact structure, reasonable in design through blocking the sediment device integration in the reaction box that thoughtlessly congeals, not only can carry out the quenching and tempering to sewage, so that subsequent sewage treatment, can effectively block the debris in the sewage moreover, prevent in the subsequent process equipment that debris got into, in addition, can reduce the setting of intaking and blocking the sediment device, also can avoid building and block the sediment channel, make with low costs, the time cycle of the emergent treatment of sewage is short, is particularly useful for portable sewage treatment system.

2. In the magnetic coagulation reaction device, the grid has the advantages of simple structure, low production cost, long service life, no power consumption, convenient installation and maintenance, good slag blocking effect, high efficiency and great convenience for workers to clean grid slag.

3. This magnetic coagulation reaction unit through setting up multistage stirring chamber and agitating unit, is favorable to the mixing of sewage and magnetic seed more even, and is favorable to improving the water conservancy dwell time of sewage to realize better quenching and tempering, more be favorable to subsequent magnetism separation effect.

4. This magnetic coagulation reaction device when utilizing grid interception suspended solid and floater in the sewage, has still fully considered the grid and has blockked up the problem that leads to stirring intracavity liquid level to rise, can ensure to coagulate reaction device normal operating for a long time, and in addition, this magnetic coagulation reaction device still is provided with automatic control alarm device to remind the staff in time to clear up the grid sediment on the sediment device.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a front view of a magnetic coagulation reaction apparatus provided in embodiment 1 of the present invention.

Fig. 2 is a top view of fig. 1 (drive motor not shown).

Fig. 3 is a view from a-a of fig. 1.

Fig. 4 is a view from direction B-B of fig. 2, in which the cross-section of the grill is trapezoidal.

Fig. 5 is a view from direction B-B of fig. 2, in which the cross-section of the grill is triangular.

Description of the drawings

A coagulation reaction box 100, a primary stirring cavity 101, a secondary stirring cavity 102, a tertiary stirring cavity 103, a grating 104, a first clapboard 105, a second clapboard 106, a notch 107, a water outlet 108, an overflow cavity 109, an overflow port 110, a side plate 111, a water inlet 112, a water outlet 113, a water outlet,

A driving motor 201, a transmission rod 202, a paddle 203,

Grid bars 301, an overflowing channel 302,

An alarm 401 and a liquid level sensor 402.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.

Example 1

Referring to fig. 1 and 2, the present embodiment provides a magnetic coagulation reaction apparatus, including a coagulation reaction tank 100, and a slag blocking device for blocking suspended substances and/or floating objects is disposed in the coagulation reaction tank 100. In the existing process for treating sewage by ultra-magnetic separation, the coagulation reaction tank 100 is usually used for providing a space for mixing magnetic seeds, PAC (polyaluminium chloride) agents, PAM (polyacrylamide) agents and sewage so as to adjust the sewage, so that the subsequent magnetic separation process can be performed normally and efficiently, and the existing coagulation reaction tank 100 is not provided with any device for intercepting suspended matters and/or floating matters, so that the problems of blockage of the subsequent working section, equipment breakage and the like easily occur; in the embodiment, the slag blocking device is integrated in the coagulation reaction box 100, so that the slag blocking device and the coagulation reaction box 100 are integrated, and the slag blocking device is used for blocking garbage, floating objects, suspended matters and other impurities carried in sewage, so that the garbage, the floating objects, the suspended matters and other impurities can be prevented from entering a subsequent treatment workshop section, the problems of blockage of the subsequent workshop section, equipment breakage and the like are avoided, the structure of the whole sewage treatment system is more compact, the arrangement of the water inlet slag blocking device can be reduced, a slag blocking channel does not need to be independently constructed, the construction requirements, civil engineering cost and the like of the slag blocking channel in the prior art can be effectively avoided, the time period of emergency treatment of sewage can be effectively shortened, and the slag blocking device is particularly suitable for a mobile sewage treatment system.

In order to reduce the volume of the coagulation reaction box 100 as much as possible and ensure that the coagulation reaction box 100 can realize better sewage conditioning treatment, in an optimal scheme, at least two stages of stirring cavities are arranged in the coagulation reaction box 100, the stirring cavities at all stages are communicated in sequence, and the slag blocking devices are respectively arranged between the adjacent two stages of stirring cavities. In this scheme, through setting up multistage stirring chamber, be favorable to mixing more evenly, and be favorable to improving the water conservancy dwell time of sewage to realize better quenching and tempering, more be favorable to subsequent magnetic separation.

It can be understood that the number of the stirring cavities may be determined according to actual requirements, that is, the coagulation reaction box 100 may include two stirring cavities, three stirring cavities, and four stirring cavities … … for convenience of description, in this embodiment, three stirring cavities are provided in the coagulation reaction box 100, which are the first-stage stirring cavity 101, the second-stage stirring cavity 102, and the third-stage stirring cavity 103, as shown in fig. 1 or fig. 2, in a more complete scheme, the coagulation reaction box 100 is further provided with a water inlet 112 and a water outlet 113, where the water inlet 112 is communicated with the first-stage stirring cavity 101, and the water outlet 113 is communicated with the second-stage stirring cavity 102.

In order to improve the mixing efficiency, in a further scheme, the mixing device further comprises a plurality of stirring devices, and the stirring devices are respectively arranged in the stirring cavity and used for stirring. Through setting up agitating unit, can effectively improve the mixing efficiency of stirring intracavity for sewage and PAC medicament and PAM medicament can be in the short time abundant contact, and the homogeneous mixing. As an example, as shown in fig. 1 or fig. 2, a stirring device is disposed in each of the three stirring chambers, and the stirring device may be a stirring device commonly used in the prior art, for example, the stirring device includes a driving motor 201, a driving rod 202, and a paddle 203 disposed on the driving rod 202, the driving motor 201 is fixed above the coagulation reaction tank 100, the driving rod 202 is connected to the driving motor 201 at an upper end thereof, and extends into the stirring chambers at a lower end thereof, and the paddle 203 is driven by the driving motor 201 to rotate, thereby achieving a stirring function.

As shown in fig. 1, in a preferred embodiment, the slag blocking device includes a grate 104, and the grate 104 is disposed in the coagulation reaction box 100 in an inclined manner, and the inclined angle may be 45 ° to 60 ° (the angle is an included angle between the grate 104 and a vertical line (plane)). The obliquely arranged grating 104 can not only enable the intercepted garbage, floating objects or suspended matters and other impurities to be kept on the grating 104, and avoid moving along with sewage, but also facilitate the workers to dig slag by using special tools (such as a tooth rake) and separate the impurities from the grating 104, thereby realizing the cleaning of the grating 104.

It is understood that, in the present embodiment, the grating 104 may be a grating 104 commonly used in the prior art, and is not described herein.

In the optimization scheme provided by this embodiment, the grid 104 includes a frame and a plurality of grid bars 301, the grid bars 301 are fixed to the frame in parallel, and flow-through channels 302 for passing through sewage are formed between two adjacent grid bars 301, as shown in fig. 3-5, that is, in this scheme, the grid 104 is composed of a plurality of grid bars 301 in parallel, flow-through channels 302 for passing through sewage are formed in gaps between two adjacent grid bars 301, and the flow-through channels 302 are parallel to each other, so that workers can clean grid slag (impurities) on the grid 104 efficiently in one direction. In this embodiment, the specific structure of the frame is not limited, and only the grid bars 301 need to be fixed together, so that the grid bars 301 do not move relatively; the grille 104 provided by the embodiment has the advantages of simple structure, low production cost and convenience in mounting/dismounting in the actual use process.

In a preferred scheme, the cross section of the grid bars 301 may be rectangular, trapezoidal or triangular, especially when the cross section of the grid bars 301 is trapezoidal or triangular, as shown in fig. 4 and 5, a gap between two adjacent grid bars 301 may form a flow passage 302 with a horn-shaped structure, when the grid 104 is installed, a large end surface of the flow passage 302 corresponds to an upstream of the sewage, and a small end surface of the flow passage 302 corresponds to a downstream of the sewage; it can be understood that, in another scheme, the flow-through channels 302 formed between two adjacent grid bars 301 in the grid 104 are in a horn-shaped structure, that is, the shape of the cross section of the grid bars 301 is not limited, and only the flow-through channels 302 in the horn-shaped structure can be formed between two adjacent grid bars 301; such structural design, on the one hand, when sewage passes through grid 104, get into and flow out from the little terminal surface from the big terminal surface that overflows passageway 302, utilize the poor debris that can push away in sewage on grid 104 of water conservancy among the flow process, thereby realize high-efficient interception and the filtration to debris, on the other hand, be favorable to realizing better cooperation with the tooth harrow, make the tooth harrow can with the accurate laminating of grid 104, thereby effectively reduce the phenomenon of running the sediment, be favorable to more thoroughly, the efficient grating sediment (debris) on clearance grid 104, also be favorable to reducing mechanical wear, noise etc. between tooth harrow and the grid 104 simultaneously.

In a preferred embodiment, the distance between two adjacent grid bars 301 in the grid 104 may be 3mm to 30 mm. The size is moderate, and impurities with different sizes in the sewage can be intercepted.

In a further preferred embodiment, the gaps between two adjacent grate bars 301 in each grate 104, which are used for passing through the sewage, are continuously reduced in the flow direction of the sewage. That is, in the scheme, the specifications of the gratings 104 are different, and along the flowing direction of the sewage, the size of the gap for passing through the sewage in each grating 104 is continuously reduced, so that impurities with different sizes in the sewage can be effectively intercepted, a better intercepting effect is realized, the subsequent sewage treatment process is more facilitated, and the problems of blockage and equipment damage caused by the impurities can be effectively avoided.

In a further scheme, overflow ports 110 are respectively arranged on one side or two sides of the slag blocking device, and the overflow ports 110 are used for overflowing. When the slag blocking device (such as the grating 104) is blocked by grating slag (sundries), the water level in the stirring cavity rises and can overflow from the overflow port 110 to the next-stage stirring cavity 101, so that the interruption of the sewage treatment process is avoided, and the magnetic coagulation reaction device can stably run for a long time.

By way of example, as shown in fig. 1, 2 or 3, in a preferred scheme, adjacent two stages of mixing chambers are separated by two partition plates, which are respectively a first partition plate 105 and a second partition plate 106 for convenience of description, the first partition plate 105 and the second partition plate 106 enclose an overflow chamber 109, that is, an overflow chamber 109 is formed between the first partition plate 105 and the second partition plate 106, wherein the first partition plate 105 is provided with a notch 107, the grating 104 is arranged in the notch 107, two sides of the notch 107 are respectively provided with an overflow port 110 for overflow, and a water passing port 108 is formed between the lower end of the second partition plate 106 and the bottom plate of the coagulation reaction tank 100 for communicating the adjacent two stages of mixing chambers. As shown by arrows in the figure, the sewage input into the primary stirring chamber 101 can pass through the grille 104 to enter the overflow chamber 109 and enter the secondary stirring chamber 102 through the water outlet 108 at the bottom of the overflow chamber 109, in the process, the grille 104 can effectively intercept suspended matters and/or floating matters carried in the sewage, and when the grille 104 is blocked, the liquid level in the primary stirring chamber 101 rises and is discharged into the overflow chamber 109 from the overflow outlet 110, so that the normal operation of the magnetic coagulation reaction device is prevented from being influenced; according to the scheme, when the grid 104 is used for intercepting suspended matters and floating objects in sewage, the problem that the liquid level in the stirring cavity is increased due to blockage of the grid 104 is fully considered, and the overflow port 110 is designed to just meet the requirement of overflow and ensure that the coagulation reaction device can normally operate.

It will be appreciated that when the grill 104 is inclined, there is necessarily a gap between the grill 104 and the first partition 105, and as shown in fig. 2, a side plate 111 may be provided at the gap to prevent sewage from leaking directly from the gap into the overflow chamber 109.

Example 2

The main difference between this embodiment 2 and the above embodiment 1 is that the magnetic coagulation reaction apparatus provided in this embodiment further includes an automatic alarm device, the automatic alarm device includes a controller, an alarm 401 and a liquid level sensor 402, the alarm 401 and the liquid level sensor 402 are respectively connected to the controller, the liquid level sensor 402 is disposed in the stirring chamber, as shown in fig. 1 or fig. 2, the liquid level sensor 402 is configured to detect liquid level height data of an upstream of the slag blocking device (i.e., the grid 104) and send the liquid level height data to the controller, and when the liquid level height data is greater than a set threshold value, the controller controls the alarm 401 to send an alarm signal. So as to remind the staff to clean the grid slag (sundries) on the slag blocking device in time.

It is understood that in the present embodiment, the set threshold may be equal to the liquid level at the overflow port 110, or may be lower than the liquid level at the overflow port 110, and the liquid level sensor 402 may be a liquid level sensor 402 commonly used in the art, which is not described herein again.

For example, the alarm 401 may adopt an audible and visual alarm 401 commonly used in the prior art, and the controller may preferably adopt a PLC, and it can be understood that the controller may also adopt a DSP chip, an ARM chip, an STP32 chip, an STC chip, or the like, and the same effects can also be achieved, and are not described herein again.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention.

Claims (9)

1. The magnetic coagulation reaction device is characterized by comprising a coagulation reaction box, wherein a slag blocking device for blocking suspended matters and/or floating matters is arranged in the coagulation reaction box;

the slag blocking device comprises a grid, the grid comprises a frame and a plurality of grid bars, the grid bars are fixed on the frame in parallel, and an overflowing channel for sewage to pass through is formed between every two adjacent grid bars.

2. The magnetic coagulation reaction device according to claim 1, wherein at least two stages of stirring chambers are arranged in the coagulation reaction tank, the stirring chambers of each stage are sequentially communicated, and the slag blocking devices are respectively arranged between the adjacent two stages of stirring chambers.

3. The magnetic coagulation reaction device according to claim 1, wherein the grating is disposed in the coagulation reaction tank at an inclination.

4. The magnetic coagulation reaction device of claim 1, wherein the cross section of the grid is rectangular, trapezoidal or triangular, or the flow passage formed between two adjacent grids in the grid is in a horn-shaped structure.

5. The magnetic coagulation reaction device of claim 1, wherein the distance between two adjacent grid bars in the grid is 3mm to 30 mm.

6. The magnetic coagulation reaction device according to claim 1, wherein gaps between two adjacent grid bars in each grid are reduced in a flow direction of the sewage, and the gaps are used for passing the sewage.

7. A magnetic coagulation reaction device according to any one of claims 1 to 6, wherein one or both sides of the slag blocking device are respectively provided with an overflow port for overflow.

8. The magnetic coagulation reaction device according to claim 2, wherein adjacent two stages of stirring chambers are separated by two partition plates, the two partition plates are respectively a first partition plate and a second partition plate, the first partition plate and the second partition plate define an overflow chamber, wherein the first partition plate is provided with a notch, the grid is arranged in the notch, overflow ports are respectively arranged on two sides of the notch for overflow, and a water passing port is formed between the lower end of the second partition plate and the bottom plate of the coagulation reaction box and is used for communicating the adjacent two stages of stirring chambers.

9. The magnetic coagulation reaction device according to claim 2 or 8, further comprising an automatic alarm device, wherein the automatic alarm device comprises a controller, an alarm and a liquid level sensor, the alarm and the liquid level sensor are respectively connected with the controller, the liquid level sensor is arranged in the stirring cavity and used for detecting liquid level height data on the upstream of the slag blocking device and sending the liquid level height data to the controller, and when the liquid level height data is larger than a set threshold value, the controller controls the alarm device to send out an alarm signal.

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